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Medium Energy Ion Scattering Spectrometry of Helium Ions Scattered from Rutile Titanium Dioxide Surfaces

Author: Zaid H. Mhsin, Nawal K. Gafil
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2018 Volume: 14 Issue: 3 Pages: 29-33
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The charge state of medium energy He ions scattered from solid surfaces depends on emerging energy and angle as well as the surface materials. We measured He+ fractions for 54-140keV He+ ions incident on rutile TiO2(110) and scattered from the top-layer Ti atoms at the [110]- and [001]-azimuth. The He+ fractions measured at both azimuths were decreased with increasing emerging angle (scaled from surface normal) and saturated at ~75 and ~85° at the [001]- and [110]-azimuth, respectively. The He+ fractions for the [110]-azimuth denoted by η110 were considerably larger by 10-20% than those for the [001]-azimuth (η) at emerging angles below ~75° (non-equilibrated). The equilibrium He+ fraction is close to the semi-empirical data given by Marion-Young. It was also found that the η110 values measured at emerging angle of ~80° were larger more than 20% compared with the η values in the emerging energy range from 50 to 130keV. Such a strong dependence on crystallographic orientation of scattering plane is simply explained by the atomic arrangements at the crystalline azimuths.

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